I installed the latest Qt5.2.0 package
and run the installerd QtCreator.
Looking in tools-options-build&run, the auto-detected kit "Desktop Qt 5.2.0 GCC 32bit" has a yellow warning triangle, with the message "Warning: No debugger set up".
It's not possible to select the debugger, the buttons are disabled. Using this kit, debugging is not possible.
Creating a new kit with 5.2.0 can be done to work around this.